/*
 * Copyright (C) 2007-2010 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#include "bu/regex.h"

#include <regex.h> // Please, please include the system regex.h file

#define re ((regex_t *)pRegEx)
#define aSubStr ((regmatch_t *)paSubStr)

Bu::RegEx::RegEx() :
	pRegEx( NULL ),
	bCompiled( false ),
	paSubStr( NULL )
{
}

Bu::RegEx::RegEx( const Bu::FString &sSrc ) :
	pRegEx( NULL ),
	bCompiled( false ),
	paSubStr( NULL )
{
	compile( sSrc );
}

Bu::RegEx::~RegEx()
{
	if( bCompiled )
	{
		regfree( re );
		delete re;
		delete[] aSubStr;
	}
}

void Bu::RegEx::compile( const Bu::FString &sSrc )
{
	if( bCompiled )
	{
		regfree( re );
		delete re;
		delete[] aSubStr;
		bCompiled = false;
	}
	pRegEx = (void *)(new regex_t);

	int nErr = regcomp( re, sSrc.getStr(), REG_EXTENDED|REG_NEWLINE );
	if( nErr )
	{
		size_t length = regerror( nErr, re, NULL, 0 );
		char *buffer = new char[length];
		(void) regerror( nErr, re, buffer, length );
		Bu::FString s( buffer );
		delete[] buffer;
		throw "???"; // BuildException( s.getStr() );
	}
	bCompiled = true;
	this->sSrc = sSrc;

	nSubStr = re->re_nsub+1;
	paSubStr = (void *)(new regmatch_t[nSubStr]);
}

int Bu::RegEx::getNumSubStrings()
{
	return nSubStr;
}

bool Bu::RegEx::execute( const Bu::FString &sSrc )
{
	sTest = sSrc;
	if( regexec( re, sSrc.getStr(), nSubStr, aSubStr, 0 ) )
		return false;
	return true;
}

void Bu::RegEx::getSubStringRange( int nIndex, int &iStart, int &iEnd )
{
	iStart = aSubStr[nIndex].rm_so;
	iEnd = aSubStr[nIndex].rm_eo;
}

Bu::FString Bu::RegEx::getSubString( int nIndex )
{
//	regmatch_t *Subs = aSubStr;
	return Bu::FString(
		sTest.getStr()+aSubStr[nIndex].rm_so,
		aSubStr[nIndex].rm_eo - aSubStr[nIndex].rm_so
		);
}